Add Items to Order

Add items to an existing order using its ID or short ID. Only works for orders belonging to the token's organization. This API conditionally accepts both tokens a) If the order status is 'List' or 'In Cart', either public or private token can be used to update the order details b) If the order status is 'New', 'In Progress' or 'Complete', only a private token can be used to update the order details